Chuck



Patented Aug. 24, 1926.

121011431) M. xummigs' 01a enossn \POINTE VILLAGE, immnxamkr.

CHUCK.

A1zplicacion filed November 12, 1923. Seria1 Nb. 674,102.

This invention relates in general to improvements in devices for tempbrarily holding similar objects in suceession, and relates more speoifieallyto improvements in tl1e 5 oonstruction and operation of metrhzinisrns or chucks for receiving, holding and subsequently releasing successive blanks or tl1e like While the same are subjected to' one or more machining operations such as the application of screw threads.

An object of the invention is to provide an improved holcling mechanism or chuck which is simple in its oonstruction andeflicient in operation.

In tl1e art of threading, pointing and otherwise machining or finishing relatively large and odd Size cap screw or bolt blanks and the like in suceession,- it haS heretofore been commerial practice to insert the successive objects in a holder by hancl, to perform the specific n1acl1ining operation de' sirecl, and to subsequently manually remove tl1e finished articles from the holder. The prior blank holding mechanisms are tremelv objeetionable because of the excessive tirne and manual labor consumed in manually removii1g each object and also because of their inability to 'automaiically and properly position and hold the blanks While they are being operated upon by the tool.

The present invention is more 'particularly directed toward improvemcnts in oho eonstruction and operation of so called work holders for the aloove clescriloed class of service, and has for its object the provision of holding mechanism which aside from requiring the insertion of the successive objects loyhandih cases Where automatie feeding is not available, is highly eflicient and entirely automatio in operation. The improved holder 0r ehuek automatically positions the sucrzessive blanks in line with the tool and positiv'ely holds the objects in proper position during the maehining oper ation. Tl1e improved device furtlrerfnore automatically compensates for relative eccentricity o1 non-alinement of diiferent po1% tions of the blank bocly, ancl automaticall v delivers the finished objects af ter tl1'e Inachining operation has been completed. Un der the present improvement,ethese beneficizil results are accomplished with the aicl of a relatively simple and compact meehanism Wl1ich may be conveniently and safely operated to produce maximum capacity.

it Will be lVhile the in1provement is described herein in conjunction with a band fecl chuck, obvious that the successive blanks may be automatically clelivered to the holder, without departinlg from tlie principles of the present inve'ntion. The improved II1eclr anism is also capalole 0f utilization for holding objects other than cap screw blanks and in connection witl1 toolsfor performing var1ous operations.

clear concption of one einloocliment of tl1e present invention and of the operation of clevices construetecl in accorclanoe thereyvith, may be had by referring t0 tl1e draw- 111g accompanying and f0rminq part of this specification in which like reference characters designate the sinne or similar parls in the various views.

Fig. 1 is a top view of the improved chuck shoWing a Cap screw blank positionecl theren1 preparatory to threading.- ancl also Sli0W- 1ng a fragmentary section of the chuck carr1er.-

Fig. 2 is a front elevation of the improvecl chuck sl10wing acap screw blank hold in position preparatory to machining the cap screw shank.

F ig. 3 is a side elevation of the improved ehuck showing a cap screw blankin normal mach1mng POSllll0n; and also showing a fragmentary section of tl1e cl1uck carrier and s1ipportinpi frame.

Fig. 4 is amother vieW of the improved chuck showing a finished cap screw beim, ejected therefrom.

The improived blank holder or chuck compnises in general a bifurcated chuck frame 3, a tiltable memloer 5 looated between tl1e bifurcations of the frame 3 und supported therefrom loy means of a transverse pivot pin 6, a coil spring 7 or equivalent means normally urging tl1e Inember 5 "so swing i one direction relzitively to t-l1e frame 3 about the pin 6,- and a guide element 10 rigidly attached to the ends of tl1e bifurcations of the frame 3. The chnck frame 3 has a rearwardly extending shank 4 adapted for insertion withi1i a socket of the reciprocalole ohuck carrier 2, a key 17 or other locking means serving to prevent turning of the blank holder relatively tothe carrier 2. The oarrier 2 is periodically reciprocalole either manually or automatically by means of a pinion, not shown, which is engage able with a 1ack 15 formed in the bottom of tl1e carrier. The carrier 2 and the elements until the loweir projeetion the coil spring 7.

assooiated therewith are supported by and are moVable relatively to the main frame 16 of the machine.

The pivoted member 5 has a vertioally swingable forward projeotion provided with horizontally swingable lower projection 13 which is adapted to engage ehe outer ex tren1ity of an adjustable abutment 14: secured to the main frarne 16, when the ca1 rier 2 and the blank holder are .receded as shown in Fig. 4. Y

Theguide element 10 is formed as a flat plate attaohed directly to the frame 3, and has a recess 12 therein 01 semi-ciroularfonn. A notch 18 at the bottom of the semi-cin eular recess 12 serves to prevent accmnulation of dirt and ehips in the reoess. The rough or partly finished cap screw blanks 8 are shown in proper positiou ready for finishing, in Figs. l, 2 and 3, and a fin ished cap screw 19 is represented as bemg egected from the holder in Fig. 4.

During normal operation of the improv ed blank holder, the earrier 2 is moved rearwardly either manually or automatieally,

/ 13 engages the adjustable abutment 14 as shovvn in Fi"g. 1, whereupon the pivoted member 5 1s swnng in a ommterclockwise direction from normal, raising the transverse slot 11 above the top of the guide element 10 and compress1ng lVith the elements thus positioned, a rough er partially finished blank 8'n1ay be inserted either manually or autmnati ;ally within the holder, with the head of the blank disposed within the transverse slot 11.v As the earrier 2 and the holder are subsequently moved forwardly in any suitable manner, the spring 7 or other urgin'g 1neans automatieally becomes elfective to swing the lnember 5 in a clock- 'wise direction until the forward projection oft-he me1nber engages the adjust-able stop 9, and the projection 13 disengages the ahntrnent 14. The shank of the blank 8 is then loosely disposed within the recess 12 of the guide element 10 as shown in Figs. 1, 2 and 3, and theforward projeeting extremity of the blank shank is ready for threading or pointing. As the fo-1Ward movement 0f the oarrier2 and of the holder is eontinued, the maohining operation is performed. Upon completion 01 the machining operation, the carrier and blank holder are again moved rearwardly in any suitable manner either manually or automatioally. During such receding 'movement of the blank holder, the lower projection 13 eventually 'strikes the abutment 14 and quiokly tilts the member 5 to the position shown in Fig, 4:, ther'eby causing the inertiabf the .upwardly moving finished blank 19 to automatically toss the blank clear of the slot 11 and entirely out of engagement with theholding mechanism. This cycle of operations may be qui.ckly repeated to efieot rapid sucoessive machihing 01 a series of blanks.

Due to the fast that the dia1neter 01 the semi-oircular reeess 12 is sligthly greater than th at 01' the shank of the blank 8, and that the width of the slot 11 is sllghtly greaoe'r than the corresponding width o1 the blank head, the blank Will be automatically oentered during 1naohining operation. The transverse d1spos1t1on o=f the slot 11, the looaeness pernntted between the member 5 and pin 6. t-he horizontal dispostion of the' pivot pin 6, andthe spring Tor other reellient restraining means, cooperate to auto- 1natioally center blanke in whieh the shank and head are relatively eocentrically disposed. The holding slot 11 positively prevents rotation of the blanks 8 during machining, and the meinber 5 and ele1nent 10 cooperate with the end faces of the head of the blank to preventendwise shifting of the blank. relatively to1the holder during reeiprc-cat-ion thereof.

The stop 9 and abutment 14 may be readily adjusted to vary thelimits of movemrnt 0f the pivoted me1nber The element 10 may be readily removed fro1n the' frame 3, and

the me1nber 5 may. be likewise re1noved byremoval of the pivot pin 6. The spring? may in some cases be replaced by other resilient urging means. and the action o1 the spring 7 may even be produced with the aid ofgravitv alone. that the entire mechanis1n is extrelnely simple and oompaet and performs its sew eral funetions positively and automatically. The improved meohanism has been. fonnd highlv efilcient in operation' and l1as produced an output far superiorto that of the prior devices 0f this general charaeter. W'hilfe ehe inoreased ontput or capaoity is partially due to the feature of automatie ejection of the finished blanks, it is also due to the feature of automatlo centering and holding 0f the blanks during the ma chining operation.

It should be understood that it isnot desired to limit the present invention to the exaet details of constructionand of operation herein shown and described, for various modifioations within the scope of the ap pended clainns may ocour to persons skilled in t-l1e art.

It is claimed and desired to seeure by Letters Patent 1. In combination, a frarne. a member carried b v said frame said member being movalo-le about a pivot and having a slotextending parallel to said pivot, a guide It Will be obv '0us' bla element associated with said frarne and having a recess in proximity t0 said slot, and means for suddenly moving said member to je-ct a blank from said recess and from said slot.

2. In cornbination, a frame, means f0r producing rectilineal movement of sainl fra1ne, a member pivotecl to said framte and havinga blank holding slotand means f0r sudclenly arresting the 1novement 0f said frame to eject a blank from said slot.

3. In combination, a movable frame, a member 1nwably associated with said fran1e and having a blank l1olding slot, means :Eor swinging said member in 0ne direction during movelnent 0f said fra1ne to hold a blank, and means for suddenly swinging saicl mernber in the opposite direetion during l;n0vernent 0f said frame t0 eject a 4. In combination, a reciprocable fraxne,

a pivoted member carried by said frame and hav1'ng a blank holding slot therein, means for swinging said member in one clirection during movement of said frame in a given direction to hold a blank, and means for sudclenly swinging said mexnber in the opposite direction during 'movement of said frame in the opposite direction t0 eject saicl blank.

5. In combination, a movable frame, a Inem'ber movably associated Wit-h said fram and having a blank holcling slot, resilient means for swinging said member in one direction to hold a blank, and means for suddenly swinging said member in the opposite direction 130 eject said blank.

6. In combination, a movable frame, a 1ne1nber pivotally supportecl from said frarne and having a blank holding slot extending transversely of the direction of movement 0f said frame, a spring f0r moving saicl rnember about its pivotal axis, and

means for arresting the movernent of sai(l member to eject a blank therefrom.

7. In co1nb1nat1on, a, frame, means for moving said frame, a member pivoted to said frame and having a blank holding slot, and a stationary abutment for arresting the movement of said member to eject a blank frorn said slot during movement of said frame.

8. In combination, a frame, a member pivotally associatecl with said frame, adjustable means for limiting the extent of piyo tal 1novement of said member in one clirection, and means for suddenly arresting -tl1e movennent of said member to produce pivotal move1nent thereof in t-he opposite clirection.

9. In combination, a movable frame, a member pivoted to said :frame and having a blank l1olcling slot, means for limiting the moven1ent of said mernber in 0ne direction, and stationary means for suddenly swinging said member in the opposite direction to eject a blank from said slot. during movement of said frame.

10. In combination, a movable fra1ne, a blank holding member movably associated with said frame, and an abutment for suddenly arresting the movement of said member t0 eject a blank therefrom during movement of said frame.

11.- In combination, a .movable frame, a n1ember movably associated with -said. frarne, resilient means -for moving said 1ne1nber in one direction 130 hold a blank, and an abut1nent for moving said member in th opposite direction t0 eject a blank therefrom cluring movement of said frame.

12. In combination, a reciprocable frame,

a member movably associated with said frame resilient means for moving saicl me1nber t0 hold a blank during movement 0f said frame in one direetion, and an ahnt- 1nent for moving said member t0 eject a blank therefro1n during movement of said fra1ne in the opposite direction.

In testimony whereof, the signature of the inventor is affixed hereto.

RICHARD M. HEAMES. 

